source3/nmbd/nmbd_workgroupdb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    NBT netbios routines and daemon - version 2
   4    Copyright (C) Andrew Tridgell 1994-1998
   5    Copyright (C) Luke Kenneth Casson Leighton 1994-1998
   6    Copyright (C) Jeremy Allison 1994-1998
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21
  22 */
  23
  24 #include "includes.h"
  25
  26 extern int ClientNMB;
  27
  28 extern uint16 samba_nb_type;
  29
  30 int workgroup_count = 0; /* unique index key: one for each workgroup */
  31
  32 /****************************************************************************
  33   Add a workgroup into the list.
  34 **************************************************************************/
  35
  36 static void add_workgroup(struct subnet_record *subrec, struct work_record *work)
  37 {
  38         work->subnet = subrec;
  39         DLIST_ADD(subrec->workgrouplist, work);
  40         subrec->work_changed = True;
  41 }
  42
  43 /****************************************************************************
  44   Create an empty workgroup.
  45 **************************************************************************/
  46
  47 static struct work_record *create_workgroup(const char *name, int ttl)
  48 {
  49         struct work_record *work;
  50         struct subnet_record *subrec;
  51         nstring nname;
  52
  53         int t = -1;
  54
  55         if((work = (struct work_record *)malloc(sizeof(*work))) == NULL) {
  56                 DEBUG(0,("create_workgroup: malloc fail !\n"));
  57                 return NULL;
  58         }
  59         memset((char *)work, '\0', sizeof(*work));
  60
  61         errno = 0;
  62         push_ascii_nstring(nname, name);
  63         if (errno == E2BIG) {
  64                 fstring tname;
  65                 pull_ascii_nstring(tname, sizeof(tname), nname);
  66                 fstrcpy(work->work_group,tname);
  67                 DEBUG(0,("create_workgroup: workgroup name %s is too long. Truncating to %s\n",
  68                         name, tname));
  69         } else {
  70                 fstrcpy(work->work_group,name);
  71         }
  72         work->serverlist = NULL;
  73
  74         work->RunningElection = False;
  75         work->ElectionCount = 0;
  76         work->announce_interval = 0;
  77         work->needelection = False;
  78         work->needannounce = True;
  79         work->lastannounce_time = time(NULL);
  80         work->mst_state = lp_local_master() ? MST_POTENTIAL : MST_NONE;
  81         work->dom_state = DOMAIN_NONE;
  82         work->log_state = LOGON_NONE;
  83
  84         work->death_time = (ttl != PERMANENT_TTL) ? time(NULL)+(ttl*3) : PERMANENT_TTL;
  85
  86         /* Make sure all token representations of workgroups are unique. */
  87
  88         for (subrec = FIRST_SUBNET; subrec && (t == -1); subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
  89                 struct work_record *w;
  90                 for (w = subrec->workgrouplist; w && t == -1; w = w->next) {
  91                         if (strnequal(w->work_group, work->work_group, sizeof(nstring)-1))
  92                                 t = w->token;
  93                 }
  94         }
  95
  96         if (t == -1)
  97                 work->token = ++workgroup_count;
  98         else
  99                 work->token = t;
 100
 101         /* No known local master browser as yet. */
 102         *work->local_master_browser_name = '\0';
 103
 104         /* No known domain master browser as yet. */
 105         *work->dmb_name.name = '\0';
 106         zero_ip(&work->dmb_addr);
 107
 108         /* WfWg  uses 01040b01 */
 109         /* Win95 uses 01041501 */
 110         /* NTAS  uses ???????? */
 111         work->ElectionCriterion  = (MAINTAIN_LIST)|(BROWSER_ELECTION_VERSION<<8);
 112         work->ElectionCriterion |= (lp_os_level() << 24);
 113         if (lp_domain_master())
 114                 work->ElectionCriterion |= 0x80;
 115
 116         return work;
 117 }
 118
 119 /*******************************************************************
 120   Remove a workgroup.
 121 ******************************************************************/
 122
 123 static struct work_record *remove_workgroup_from_subnet(struct subnet_record *subrec,
 124                                      struct work_record *work)
 125 {
 126         struct work_record *ret_work = NULL;
 127
 128         DEBUG(3,("remove_workgroup: Removing workgroup %s\n", work->work_group));
 129
 130         ret_work = work->next;
 131
 132         remove_all_servers(work);
 133
 134         if (!work->serverlist) {
 135                 if (work->prev)
 136                         work->prev->next = work->next;
 137                 if (work->next)
 138                         work->next->prev = work->prev;
 139
 140                 if (subrec->workgrouplist == work)
 141                         subrec->workgrouplist = work->next;
 142
 143                 ZERO_STRUCTP(work);
 144                 SAFE_FREE(work);
 145         }
 146
 147         subrec->work_changed = True;
 148
 149         return ret_work;
 150 }
 151
 152 /****************************************************************************
 153   Find a workgroup in the workgroup list of a subnet.
 154 **************************************************************************/
 155
 156 struct work_record *find_workgroup_on_subnet(struct subnet_record *subrec,
 157                                              const char *name)
 158 {
 159         struct work_record *ret;
 160
 161         DEBUG(4, ("find_workgroup_on_subnet: workgroup search for %s on subnet %s: ",
 162                 name, subrec->subnet_name));
 163
 164         for (ret = subrec->workgrouplist; ret; ret = ret->next) {
 165                 if (strnequal(ret->work_group,name,sizeof(nstring)-1)) {
 166                         DEBUGADD(4, ("found.\n"));
 167                         return(ret);
 168                 }
 169         }
 170         DEBUGADD(4, ("not found.\n"));
 171         return NULL;
 172 }
 173
 174 /****************************************************************************
 175   Create a workgroup in the workgroup list of the subnet.
 176 **************************************************************************/
 177
 178 struct work_record *create_workgroup_on_subnet(struct subnet_record *subrec,
 179                                                const char *name, int ttl)
 180 {
 181         struct work_record *work = NULL;
 182
 183         DEBUG(4,("create_workgroup_on_subnet: creating group %s on subnet %s\n",
 184                 name, subrec->subnet_name));
 185
 186         if ((work = create_workgroup(name, ttl))) {
 187                 add_workgroup(subrec, work);
 188                 subrec->work_changed = True;
 189                 return(work);
 190         }
 191
 192         return NULL;
 193 }
 194
 195 /****************************************************************************
 196   Update a workgroup ttl.
 197 **************************************************************************/
 198
 199 void update_workgroup_ttl(struct work_record *work, int ttl)
 200 {
 201         if(work->death_time != PERMANENT_TTL)
 202                 work->death_time = time(NULL)+(ttl*3);
 203         work->subnet->work_changed = True;
 204 }
 205
 206 /****************************************************************************
 207  Fail function called if we cannot register the WORKGROUP<0> and
 208  WORKGROUP<1e> names on the net.
 209 **************************************************************************/
 210
 211 static void fail_register(struct subnet_record *subrec, struct response_record *rrec,
 212                           struct nmb_name *nmbname)
 213 {
 214         DEBUG(0,("fail_register: Failed to register name %s on subnet %s.\n",
 215                 nmb_namestr(nmbname), subrec->subnet_name));
 216 }
 217
 218 /****************************************************************************
 219  If the workgroup is our primary workgroup, add the required names to it.
 220 **************************************************************************/
 221
 222 void initiate_myworkgroup_startup(struct subnet_record *subrec, struct work_record *work)
 223 {
 224         int i;
 225
 226         if(!strnequal(lp_workgroup(), work->work_group,sizeof(nstring)-1))
 227                 return;
 228
 229         /* If this is a broadcast subnet then start elections on it if we are so configured. */
 230
 231         if ((subrec != unicast_subnet) && (subrec != remote_broadcast_subnet) &&
 232                         (subrec != wins_server_subnet) && lp_preferred_master() && lp_local_master()) {
 233                 DEBUG(3, ("initiate_myworkgroup_startup: preferred master startup for \
 234 workgroup %s on subnet %s\n", work->work_group, subrec->subnet_name));
 235                 work->needelection = True;
 236                 work->ElectionCriterion |= (1<<3);
 237         }
 238
 239         /* Register the WORKGROUP<0> and WORKGROUP<1e> names on the network. */
 240
 241         register_name(subrec,lp_workgroup(),0x0,samba_nb_type|NB_GROUP, NULL, fail_register,NULL);
 242         register_name(subrec,lp_workgroup(),0x1e,samba_nb_type|NB_GROUP, NULL, fail_register,NULL);
 243
 244         for( i = 0; my_netbios_names(i); i++) {
 245                 const char *name = my_netbios_names(i);
 246                 int stype = lp_default_server_announce() | (lp_local_master() ?  SV_TYPE_POTENTIAL_BROWSER : 0 );
 247
 248                 if(!strequal(global_myname(), name))
 249                         stype &= ~(SV_TYPE_MASTER_BROWSER|SV_TYPE_POTENTIAL_BROWSER|SV_TYPE_DOMAIN_MASTER|SV_TYPE_DOMAIN_MEMBER);
 250
 251                 create_server_on_workgroup(work,name,stype|SV_TYPE_LOCAL_LIST_ONLY, PERMANENT_TTL,
 252                                 string_truncate(lp_serverstring(), MAX_SERVER_STRING_LENGTH));
 253                 DEBUG(3,("initiate_myworkgroup_startup: Added server name entry %s \
 254 on subnet %s\n", name, subrec->subnet_name));
 255         }
 256 }
 257
 258 /****************************************************************************
 259   Dump a copy of the workgroup database into the log file.
 260   **************************************************************************/
 261
 262 void dump_workgroups(BOOL force_write)
 263 {
 264         struct subnet_record *subrec;
 265         int debuglevel = force_write ? 0 : 4;
 266
 267         for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
 268                 if (subrec->workgrouplist) {
 269                         struct work_record *work;
 270
 271                         if( DEBUGLVL( debuglevel ) ) {
 272                                 dbgtext( "dump_workgroups()\n " );
 273                                 dbgtext( "dump workgroup on subnet %15s: ", subrec->subnet_name );
 274                                 dbgtext( "netmask=%15s:\n", inet_ntoa(subrec->mask_ip) );
 275                         }
 276
 277                         for (work = subrec->workgrouplist; work; work = work->next) {
 278                                 DEBUGADD( debuglevel, ( "\t%s(%d) current master browser = %s\n", work->work_group,
 279                                         work->token, *work->local_master_browser_name ? work->local_master_browser_name : "UNKNOWN" ) );
 280                                 if (work->serverlist) {
 281                                         struct server_record *servrec;
 282                                         for (servrec = work->serverlist; servrec; servrec = servrec->next) {
 283                                                 DEBUGADD( debuglevel, ( "\t\t%s %8x (%s)\n",
 284                                                         servrec->serv.name,
 285                                                         servrec->serv.type,
 286                                                         servrec->serv.comment ) );
 287                                         }
 288                                 }
 289                         }
 290                 }
 291         }
 292 }
 293
 294 /****************************************************************************
 295   Expire any dead servers on all workgroups. If the workgroup has expired
 296   remove it.
 297   **************************************************************************/
 298
 299 void expire_workgroups_and_servers(time_t t)
 300 {
 301         struct subnet_record *subrec;
 302
 303         for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
 304                 struct work_record *work;
 305                 struct work_record *nextwork;
 306
 307                 for (work = subrec->workgrouplist; work; work = nextwork) {
 308                         nextwork = work->next;
 309                         expire_servers(work, t);
 310
 311                         if ((work->serverlist == NULL) && (work->death_time != PERMANENT_TTL) &&
 312                                         ((t == -1) || (work->death_time < t))) {
 313                                 DEBUG(3,("expire_workgroups_and_servers: Removing timed out workgroup %s\n",
 314                                                 work->work_group));
 315                                 remove_workgroup_from_subnet(subrec, work);
 316                         }
 317                 }
 318         }
 319 }